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参数资料
| 型号： | TC642 |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with FanSense⑩ Technology |
| 中文描述： | 与FanSense PWM风扇速度控制器⑩技术 |
| 文件页数： | 13/28页 |
| 文件大小： | 485K |
| 代理商： | TC642 |
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2002 Microchip Technology Inc.
DS21444C-page 13
TC642
Some applications require the fan to be powered from
the negative 12V supply to keep motor noise out of the
positive voltage power supplies. As is shown in
Figure 5-8, zener diode D
1
offsets the -12V power sup-
ply voltage, holding transistor Q
1
off when V
OUT
is low.
When V
OUT
is high, the voltage at the anode of D
1
increases by V
OUT
, causing Q
1
to turn on. Operation is
otherwise consistent with the case of fan operation
from +12V.
FIGURE 5-7:
Output Drive Transistor Circuit Topologies.
FIGURE 5-8:
Powering the Fan From a -12V Supply.
Q
1
Q
1
Q
2
GND
VDD
R
SENSE
R
BASE
V
OUT
V
OUT
Fan
a) Single Bipolar Transistor
Q
1
GND
V
DD
R
SENSE
V
OUT
c) N-Channel MOSFET
GND
V
DD
R
SENSE
R
BASE
Fan
b) Darlington Transistor Pair
Fan
GND
+5V
Q
1
*
V
DD
V
OUT
TC642
Fan
R
2
*
2.2 k
R
3
*
2.2
R
4
*
10 k
D
12.0V
Zener
-12V
*Note:
Value depends on the specific application and is shown for example only.
相关PDF资料 |
PDF描述 |
|---|---|
| TC642EV | PWM Fan Speed Controller with FanSense⑩ Technology |
| TC654EUN | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC655EUN | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC654 | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
| TC655 | Dual SMBus⑩ PWM Fan Speed Controllers With Fan Fault Detection |
相关代理商/技术参数 |
参数描述 |
|---|---|
| TC642_13 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controller with FanSensea?￠ Technology |
| TC642B | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC642B_13 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSensea?￠ Technology for Fault Detection |
| TC642BEOA | 功能描述:马达/运动/点火控制器和驱动器 w/Rstrt & Flt Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642BEOA713 | 功能描述:马达/运动/点火控制器和驱动器 w/Rstrt & Flt Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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